<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">

      <div @mouseenter="navIsEnter=true" @mouseleave="navIsEnter=false">
        <h2 class="all">全部商品分类</h2>
        <div class="sort" v-show="sortIsShow">
          <div class="all-sort-list2" @mouseenter="containerMouseEnter" @mouseleave="containerMouseLeave">
            <!--          一级目录-->
            <div class="item" v-for="(firstFloor,index) in categoryList"
                 @mouseenter="itemMouseEnterThrottle(index)"
                 :class="currentIndex===index? 'active':''"
                 @click="toSearch"
                 :key="firstFloor.categoryId">
              <h3>
                <a :data-categoryName="firstFloor.categoryName" :data-category1Id="firstFloor.categoryId">{{firstFloor.categoryName}}</a>
              </h3>
              <div class="item-list clearfix">
                <div class="subitem">
                  <!--                二级目录-->
                  <dl class="fore" v-for="secondFloor in firstFloor.categoryChild" :key="secondFloor.categoryId">
                    <dt>
                      <a :data-categoryName="secondFloor.categoryName" :data-category2Id="secondFloor.categoryId">{{secondFloor.categoryName}}</a>
                    </dt>
                    <!--                   三级目录-->
                    <dd>
                      <em v-for="thirdFloor in secondFloor.categoryChild" :key="thirdFloor.categoryId">
                        <a :data-categoryName="thirdFloor.categoryName" :data-category3Id="thirdFloor.categoryId">{{thirdFloor.categoryName}}</a>
                      </em>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>

    </div>
  </div>
</template>

<script>
import {mapActions, mapState} from "vuex";
import {throttle} from 'lodash'

export default {
  name: "TypeNav",
  mounted() {
    this.getCategoryList()
    this.itemMouseEnterThrottle = throttle(this.itemMouseEnter,150)
  },
  data(){
    return{
      //鼠标移入当前列表对应的索引值
      currentIndex:-1,
    //  是否移入container容器(节流优化)
      isLeave:true,
    //  鼠标移入移出
      navIsEnter:false
    }
  },
  methods:{
    ...mapActions('category',['getCategoryList']),
    itemMouseEnter(index){
      if(this.isLeave)return
      this.currentIndex = index
    },
    itemMouseEnterThrottle(){},
    containerMouseLeave(){
      this.isLeave = true
      this.currentIndex = -1
    },
    containerMouseEnter(){
      this.isLeave = false
    },
  //  跳转到搜索页
    toSearch(e){
      const {categoryname:categoryName,category1id:category1Id,category2id:category2Id,category3id:category3Id} = e.target.dataset
      if (!categoryName)return
      const params = this.$route.params
      this.$router.replace({name:'Search',query:{categoryName,category1Id,category2Id,category3Id},params})
    }
  },
  computed:{
    ...mapState('category',['categoryList']),
    sortIsShow(){
      if(this.$route.name==='Home')return true
      return this.navIsEnter
    }
  },
  watch:{
    $route(){
      this.navIsEnter = false
    }
  }
}
</script>

<style scoped lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &.active {
            &>h3{
              background-color: #ccc;
            }
            .item-list {
              display: block;
            }
          }
        }
      }
    }
  }
}
</style>